In https://lore.kernel.org/lkml/CAHk-=wijdojzo56FzYqE5TOYw2Vws7ik3LEMGj9SPQaJJ+Z73Q@xxxxxxxxxxxxxx/ Linus offers the opinion that kunmap calls should imply a flush_dcache_page(). Christoph added calls to flush_dcache_page() in commit 8dad53a11f8d. Was this "voodoo programming", or was there a real problem being addressed?
